Nazario Cipriani Matthias Wieland Matthias Großmann Daniela Nicklas Tool Support for the Design and Management of Spatial Context Models. 74-87 2009 ADBIS http://dx.doi.org/10.1007/978-3-642-03973-7_7 conf/adbis/2009 db/conf/adbis/adbis2009.html#CiprianiWGN09